Ventilation system between power plant pipelines and power plant

Abstract

The invention relates to the technical field of ventilation systems, in particular to a ventilation system between power plant pipelines and a power plant. The air supply branch pipe is provided with a first air supply branch and an air supply outlet. The air exhaust branch pipe is provided with a first air exhaust branch and an air exhaust outlet. The first air supply branch and the first air exhaust branch are each provided with an isolation valve, and the isolation valves are used for restraining gas in the pipeline room from entering the first air supply branch and the first air exhaust branch when a crevasse occurs in the pipeline room. In the embodiment of the invention, under the condition that the pipeline breaks, the environment in the pipeline room can be quickly deteriorated, and the air supply outlet and the exhaust outlet are closed through the isolation valve, so that the situation that gas in the pipeline room flows to other rooms through the ventilation system and pollutes the other rooms can be reduced. According to the control method disclosed by the invention, the pipeline room can be sealed by relatively rapid response under the condition of breaking, so that gas overflow in the pipeline room is reduced, and the influence range of an accident is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of ventilation systems, and in particular to a ventilation system between pipelines of a power plant and a power plant. Background Art

[0002] Power plants often have duct rooms for high-energy piping. These are pipelines with a maximum operating pressure of 2 MPa or higher, or a maximum operating temperature of 100°C or higher. The medium within these pipes can be either liquid or gas. To cool these duct rooms, ventilation systems are installed to continuously deliver cold air, thereby lowering the temperature within the duct rooms to meet the required requirements.

[0003] In the related art, when a pipeline rupture accident occurs, the scope of impact is relatively large. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a ventilation system between pipelines of a power plant and a power plant, which can reduce the impact range in the event of a pipeline rupture accident.

[0005] According to a first aspect of the present application, a ventilation system is used in a power plant, wherein the power plant includes a pipeline room, and the ventilation system includes: an air supply branch pipe having a first air supply branch and an air supply port, wherein gas can flow from the first air supply branch to the air supply port to enter the duct room; an exhaust branch pipe having a first exhaust branch and an exhaust port, wherein gas can flow from the interior of the duct room through the exhaust port to the first exhaust branch; Isolation valve, the first air supply branch and the first exhaust branch are both provided with the isolation valve, the isolation valve is used to inhibit the gas in the pipeline room from entering the first air supply branch and the first exhaust branch when a rupture occurs in the pipeline room, and the isolation valve is configured to withstand a first preset temperature, and / or a preset air pressure, and / or a first preset radioactive dose.

[0006] In the solution of the embodiment of the present application, in the event of a rupture accident in the pipeline, the environment in the pipeline room will deteriorate rapidly. By closing the air supply and exhaust vents through the isolation valve, it is possible to reduce the gas in the pipeline room from flowing to other rooms through the ventilation system, thereby contaminating other rooms. The control method of the present application can react relatively quickly in the event of a rupture to close the pipeline room, reduce the gas overflow in the pipeline room, and reduce the scope of the accident. Furthermore, the isolation valve is configured to withstand a first preset temperature, a preset air pressure, and a first preset radioactive dose. In the event of a rupture in the pipeline room, the isolation valve can still remain stable and close the air supply and exhaust vents, and the isolation valve has a good isolation effect.

[0007] According to some embodiments of the present application, the ventilation system also includes a first monitor and a controller, the first monitor is configured to obtain at least one of the temperature in the pipe room, the height of the pit liquid level in the pipe room, and the air pressure in the pipe, and the controller is configured to control the opening and closing state of the isolation valve. The controller can determine whether a breach occurs in the pipe in the pipe room based on the data obtained by the first monitor. When the controller determines that a breach occurs, the controller controls the isolation valve to close the air supply port and the exhaust port.

[0008] According to some embodiments of the present application, when the data acquired by the first monitor meets a first condition, the controller closes the isolation valve corresponding to the air supply port and the isolation valve corresponding to the air exhaust port; The first condition is at least one of the following: The temperature in the pipeline room is greater than or equal to a second preset temperature; The liquid level height of the pit between the pipelines is greater than or equal to the preset liquid level height of the pit; The rate of change of the air pressure in the pipeline is greater than or equal to a preset rate of change; The second preset temperature is 75° C., and / or the preset pit liquid level height is 0.15 m, and / or the preset change rate is 830 Pa / s.

[0009] According to some embodiments of the present application, the exhaust branch pipe also has a second exhaust branch and a third exhaust branch, and the second exhaust branch and the third exhaust branch can both be connected to the first exhaust branch. The ventilation system also includes a first sealing valve arranged on the second exhaust branch and a second sealing valve arranged on the third exhaust branch. The third exhaust branch is used to be connected to the nuclear island chimney. When the controller determines that a breach has occurred, the isolation valve and the first sealing valve are closed. When the first monitor monitors that the temperature in the pipeline room reaches the exhaust temperature, the isolation valve and the second sealing valve are opened to connect the nuclear island chimney with the pipeline room.

[0010] According to some embodiments of the present application, the ventilation system further includes a filter assembly, which is disposed in the third exhaust branch and is located downstream of the second sealing valve.

[0011] According to some embodiments of the present application, the filtration assembly includes a filter and an iodine adsorber.

[0012] According to some embodiments of the present application, the ventilation system further includes a second monitor and a controller, wherein the second monitor is configured to obtain at least one of the temperature, air pressure, and radioactive dose in the pipeline, and when the data obtained by the second monitor meets a second condition, the controller closes the isolation valve corresponding to the exhaust port; The second condition is at least one of the following: The temperature in the pipeline is greater than or equal to a first preset temperature; The air pressure in the pipeline is greater than or equal to the preset air pressure; The radiation dose in the pipe is greater than or equal to a first preset radiation dose.

[0013] According to some embodiments of the present application, when the data acquired by the second monitor meets the second condition and no breach occurs, the controller closes the isolation valve corresponding to the exhaust port and opens the isolation valve corresponding to the supply port.

[0014] According to some embodiments of the present application, the ventilation system further includes an air supply regulating valve, which is installed on the first air supply branch and is located upstream of the isolation valve corresponding to the first air supply branch, and / or, The ventilation system further includes an exhaust regulating valve, which is installed on the first exhaust branch and is located downstream of the isolation valve corresponding to the first exhaust branch.

[0015] According to some embodiments of the present application, the isolation valve is a butterfly valve.

[0016] The present application also provides a power plant, comprising: Pipe room, with installation room; a pipeline located in the installation room; A ventilation system as described in any one of the above items is installed between the pipes, and the ventilation system is used to cool the pipes.

[0017] According to some embodiments of the present application, the duct room includes an isolation tube and a duct room body, the installation chamber is formed in the duct room body, the isolation tube is sealingly installed in the duct room body, the duct room body further has an opening communicating with the installation chamber, the isolation tube is communicated with at least one of the openings, and the isolation valve can be installed in the isolation tube to prevent gas in the installation chamber from entering the corresponding first air supply branch and / or the first air exhaust branch; Wherein, the isolation tube is configured to be able to withstand the first preset temperature, and / or the preset air pressure, and / or the first preset radioactive dose.

[0018] According to some embodiments of the present application, the pipeline room also has a pressure relief port connecting the installation room and the outside world. The power plant also includes an explosive device installed in the pipeline room. The explosive device can isolate the installation room from the outside world. The explosive device can open the pressure relief port under the condition of bearing the rated air pressure so that the gas in the installation room can flow from the pressure relief port to the outside world.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present application is further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the assembly between the ventilation system and the pipeline according to one embodiment of the present application; Figure 2 This is a simplified structural diagram of a ventilation system according to an embodiment of the present application, showing a second exhaust branch and a third exhaust branch; Figure 3 This is a flow chart of a method for controlling a ventilation system according to an embodiment of the present application; Figure 4 This is a flow chart of a method for controlling a ventilation system according to an embodiment of the present application; Figure 5 Schematic diagram of a flow chart of a method for controlling a ventilation system according to an embodiment of the present application.

[0021] Reference numerals: 100, air supply branch pipe; 110, first air supply branch; 120, air supply outlet; 130, second air supply branch; 200, exhaust branch pipe; 210, first exhaust branch; 220, exhaust outlet; 230, fourth exhaust branch; 240, second exhaust branch; 250, third exhaust branch; 310, first isolation valve; 320, second isolation valve; 400, air supply regulating valve; 500, exhaust regulating valve; 600, duct room; 600a, installation room; 610, isolation pipe; 620, duct room main body; 620a, opening; 700, first sealing valve; 800, second sealing valve; 900, filter assembly; 910, filter; 920, iodine adsorber. DETAILED DESCRIPTION

[0022] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0023] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or workstation relationships, are based on the orientations or workstation relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0024] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0025] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0026] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0027] In related technologies, ventilation systems are installed within ductwork rooms to cool them. In the event of a duct breach, the medium within the ductwork can escape into the ductwork room, rapidly deteriorating the environment within the ductwork room. The medium within the ductwork can then enter the ventilation system through exhaust or air supply vents, and then flow into other rooms. Equipment or personnel in other rooms could be affected by the medium within the ductwork, expanding the scope of the accident.

[0028] In the ventilation system of the present application, in the event of a rupture accident in the pipeline, the isolation valve can prevent the gas in the pipeline room 600 from entering the first air supply branch 110 and the first air exhaust branch 210, reducing the flow of the medium in the pipeline from the ventilation system to other areas, thereby reducing the scope of the impact of the accident.

[0029] This application also provides a ventilation system for power plant pipelines, please refer to Figure 1 The ventilation system is used in a power plant. The power plant includes a duct room 600 and ducts, which are arranged within the duct room 600. For example, the power plant may be a nuclear power plant, and the duct room 600 may be a high-energy duct room. The ventilation system includes a supply branch pipe 100, an exhaust branch pipe 200, and an isolation valve. The supply branch pipe 100 has a first supply branch 110 and an air supply port 120. Gas can flow from the first supply branch 110 to the air supply port 120 and enter the duct room 600, thereby cooling the ducts within the duct room 600. The exhaust branch pipe 200 has a first exhaust branch 210 and an exhaust port 220. Gas can flow from the interior of the duct room 600 through the exhaust port 220 to the first exhaust branch 210. Gas within the duct room 600 can enter the first exhaust branch 210 through the exhaust port 220 and then return to the ventilation system.

[0030] Both the first air supply branch 110 and the first exhaust branch 210 are equipped with isolation valves. These valves are used to prevent gas from entering the duct room 600 from the first air supply branch 110 and the first exhaust branch 210 in the event of a breach in the duct room 600. Exemplarily, the isolation valves are installed at the ends of the first air supply branch 110 and the first exhaust branch 210. The isolation valve corresponding to the air supply branch 100 has one end mounted to the first air supply branch 110 and the other end mounted to the sidewall of the duct room 600. The isolation valve corresponding to the exhaust branch 200 has one end mounted to the first exhaust branch 210 and the other end mounted to the sidewall of the duct room 600. The isolation valves are configured to withstand a first preset temperature, a preset air pressure, and a first preset radioactive dose. They can maintain operational performance even in harsh environments. In the event of a duct breach, they can prevent the medium in the duct room 600 from flowing into the ventilation system, thereby reducing contamination of other areas. Exemplarily, the first preset temperature is 100° C., the preset gas pressure is 0.1 MPa, and the first preset radioactive dose is 100 kGy.

[0031] In the solution of the embodiment of the present application, in the event of a breach in the pipeline, the environment in the duct room 600 will deteriorate rapidly. By closing the air supply port 120 and the exhaust port 220 through the isolation valve, the gas in the duct room 600 can be reduced from flowing to the other rooms through the ventilation system, thereby contaminating other rooms. The present application can react relatively quickly in the event of a breach to close the duct room 600, reduce the gas overflow in the duct room 600, and reduce the scope of the accident. Furthermore, the isolation valve is configured to withstand a first preset temperature, a preset air pressure, and a first preset radioactive dose. In the event of a breach in the duct room 600, the isolation valve can still remain stable and close the air supply port 120 and the exhaust port 220, and the isolation valve has a good isolation effect.

[0032] In one embodiment, the ventilation system further includes a first monitor and a controller. The first monitor is configured to obtain at least one of the temperature within the duct room 600, the liquid level in the pit within the duct room 600, and the air pressure within the duct. It should be noted that the first monitor does not refer to a single monitoring instrument. The first monitor includes at least one of a temperature sensor, a liquid level sensor, and an air pressure sensor. The temperature sensor is used to monitor the temperature within the duct room 600, the liquid level sensor is used to monitor the liquid level in the pit within the duct room 600, and the air pressure sensor is used to obtain the air pressure within the duct. When multiple values ​​need to be obtained, the first monitor includes multiple types of sensors. The controller is configured to control the opening and closing state of the isolation valve. The controller can determine whether a breach has occurred in the duct within the duct room 600 based on the data obtained by the first monitor. When the controller determines that a breach has occurred, the controller controls the isolation valve to close the air supply port 120 and the air exhaust port 220.

[0033] In the embodiment of the present application, the temperature within the duct room 600, the height of the pit liquid level, and the air pressure within the duct determine whether to close the air supply 120 and exhaust 220 of the ventilation system. In the event of a rupture in the duct, the environment within the duct room 600 will rapidly deteriorate. Closing the air supply 120 and exhaust 220 can reduce the flow of gas within the duct room 600 through the ventilation system to other rooms, thereby contaminating other rooms. The present application can react relatively quickly to close the duct room 600 in the event of a rupture, reducing the escape of gas within the duct room 600 and reducing the scope of the accident.

[0034] In one embodiment, when the data acquired by the first monitor meets the first condition, the controller closes the isolation valve corresponding to the air supply port 120 and the isolation valve corresponding to the air exhaust port 220; The first condition is at least one of the following: The temperature in the pipeline room 600 is greater than or equal to the second preset temperature; The pit liquid level within 600 meters of the pipeline is greater than or equal to the preset pit liquid level; The rate of change of the air pressure in the pipeline is greater than or equal to the preset rate of change; In the embodiment of the present application, the controller can react relatively quickly to seal the duct room 600 when the first condition is met, thereby reducing gas leakage from the duct room 600 and narrowing the scope of the accident. Furthermore, in the event of a pipeline rupture, the air pressure within the pipeline will drop relatively quickly. The rate of change in the air pressure within the pipeline can reflect the rupture, further improving the response speed of the control method and reducing the extent of medium leakage.

[0035] In one embodiment, the second preset temperature is 75°C. When the medium temperature is high, it may affect heat-sensitive devices in other rooms, causing them to overheat and impact their normal operation. The preset pit level is 0.15m. Normally, the pit level in duct room 600 is 0m. When the pit level in duct room 600 reaches a certain level, a breach is detected, and the air supply vent 120 and exhaust vent 220 are sealed to allow operators to repair the breach. The preset rate of change is 830 Pa / s. If the pipeline does not have a breach, some leakage may occur due to sealing issues. However, if a breach occurs, the air pressure in the pipeline will drop more rapidly. Therefore, by monitoring the rate of change of air pressure using the preset rate of change, breaches can be detected more accurately, reducing false alarms. In another embodiment, the radioactive dose in duct room 600 can also be obtained. The first condition also includes that the radioactive dose in duct room 600 is greater than or equal to a first effective radioactive dose. For example, the first effective radioactive dose rate is 1 mSv / h. Higher radiation doses can cause degradation of instrument components and alter the properties of metal materials, potentially affecting proper operation. Setting the second preset temperature, the preset pit level, and the preset rate of change within appropriate ranges can effectively minimize the impact of the medium on the ventilation system and reduce the risk of false triggering of closures without a breach.

[0036] It is understood that, in the absence of a pipeline breach, the temperature within the duct room 600 ranges from approximately 10°C to 45°C, and the pressure within the duct room 600 is typically maintained at a negative pressure of 50 Pa to 100 Pa relative to standard atmospheric pressure. Given a low radioactive dose in the medium within the duct room 600, the negative pressure can reduce the risk of radioactively charged media leaking from the boundary gaps within the duct room 600 to the outside, thereby minimizing external contamination. The cumulative radioactive dose within the duct room 600 over 10 years is approximately 350 Gy.

[0037] In one embodiment, please refer to Figure 2The exhaust branch duct 200 also includes a second exhaust branch 240 and a third exhaust branch 250. Both the second exhaust branch 240 and the third exhaust branch 250 are communicable with the first exhaust branch 210 and are arranged in parallel. The ventilation system also includes a first sealing valve 700 disposed in the second exhaust branch 240 and a second sealing valve 800 disposed in the third exhaust branch 250. For example, the first sealing valve 700 and the second sealing valve 800 may be sealing dampers. The third exhaust branch 250 is connected to the nuclear island chimney, while the second exhaust branch 240 is connected to other normal exhaust equipment. If no breach occurs in the duct room 600, the first sealing valve 700 is open and the second sealing valve 800 is closed. Gas within the duct room 600 can flow through the first exhaust branch 210 and the first sealing valve 700 to the third exhaust branch 250. When the controller detects a breach, it closes the isolation valve and first sealing valve 700. If the first monitor detects that the temperature inside the duct room 600 has reached the exhaust temperature, the isolation valve and second sealing valve 800 are opened to connect the nuclear island chimney to the duct room 600. For example, the exhaust temperature is 45°C. After a breach occurs inside the duct room 600, a significant amount of contaminated gas fills the duct room 600. The third exhaust branch 250 filters and discharges the contaminated gas inside the duct room 600, increasing the efficiency of accident handling. Furthermore, by condensing the contaminated gas inside the duct room 600 after the temperature reaches the exhaust temperature, the contaminated gas inside the duct room 600 is reduced, minimizing the risk of damage and preventing damage to the filter components. Furthermore, the contaminated gas is discharged to the outside through the nuclear island chimney, minimizing environmental pollution.

[0038] In one embodiment, please refer to Figure 2 The ventilation system also includes a filter assembly 900, which is disposed in the third exhaust branch 250, downstream of the second sealing valve 800. As the contaminated gas in the duct room 600 flows from the third exhaust branch 250 to the nuclear island chimney, the filter assembly 900 can absorb pollutants in the contaminated gas, thereby reducing pollution to the external environment.

[0039] In one embodiment, please refer to Figure 2The filter assembly 900 includes a filter 910 and an iodine adsorber 920. Exemplarily, the filter 910 includes a HEPA filter and a low-efficiency filter, and the low-efficiency filter is located upstream of the HEPA filter. The low-efficiency filter is used to remove large-particle pollutants in the gas, thereby protecting the HEPA filter. The HEPA filter and the iodine adsorber 920 have a good adsorption effect on pollutants in the contaminated gas, and the HEPA filter can remove aerosols in the contaminated gas. The iodine adsorber 920 can remove iodine-containing radioactive pollutants, thereby effectively reducing the level of pollutants in the contaminated gas, and the filter assembly 900 has a good filtering effect.

[0040] In one embodiment, the ventilation system further includes an exhaust fan and a check valve disposed on the third exhaust branch 250. The exhaust fan provides power for exhausting the gas in the duct room 600 toward the nuclear island chimney, and the check valve reduces the flow of external gas from the nuclear island chimney into the duct room 600.

[0041] In one embodiment, the ventilation system further includes a second monitor and a controller. The second monitor is configured to obtain at least one of the temperature, air pressure, and radioactive dose in the pipeline. When the data obtained by the second monitor meets a second condition, the controller closes the isolation valve corresponding to the exhaust port 220. The second condition is at least one of the following: The temperature in the pipeline is greater than or equal to a first preset temperature; The air pressure in the pipeline is greater than or equal to the preset air pressure; The radiation dose in the pipeline is greater than or equal to a first preset radiation dose.

[0042] In the solution of the embodiment of the present application, when the environment in the pipeline reaches one of the first preset temperature, the preset air pressure, and the first preset radioactive dose, it can be determined that the medium currently being transported in the pipeline is in a high state. When the medium in the pipeline reaches a high state, the consequences of a pipeline rupture accident are more serious than in normal situations. Sealing the exhaust port 220 in advance before a rupture accident occurs can further reduce the possibility of the medium entering the ventilation system through the exhaust port 220 in the event of a rupture accident, and the ventilation system's response has an early warning effect.

[0043] In one embodiment, when the data acquired by the second monitor meets the second condition and no breach occurs, the controller closes the isolation valve corresponding to the exhaust port 220 and opens the isolation valve corresponding to the air supply port 120 .

[0044] For example, the absence of a pipeline breach can indicate that the temperature within pipeline room 600, the pit liquid level, and the rate of change of the air pressure within the pipeline meet a third condition. The third condition is that the temperature within pipeline room 600 is less than a second preset temperature, the pit liquid level within pipeline room 600 is less than a preset pit liquid level, and the rate of change of the pipeline air pressure is less than a preset rate of change. It is understood that the third condition and the first condition are mutually exclusive; that is, the third condition and the first condition cannot be met simultaneously.

[0045] In the solution of the embodiment of the present application, when the medium in the pipeline reaches a high state and no breach accident occurs, the exhaust port 220 of the ventilation system can be closed in advance to further reduce the flow of the medium to other areas. Keeping the air supply port 120 in an open state enables the ventilation system to continuously cool the duct room. The ventilation system continuously delivers cold air to the interior of the duct room 600 through the air supply port 120, which can reduce the temperature of the duct room. The local air pressure at the air supply port 120 is positive. In the event of a breach accident, the medium flowing out of the duct is difficult to quickly enter the ventilation system from the air supply port 120. The air supply port 120 can still be closed relatively promptly, so that when the duct room 600 further deteriorates, the medium enters the interior of the ventilation system.

[0046] It is understood that under normal circumstances, the medium in the pipeline is in a low state (the medium temperature is less than a first preset temperature, the medium pressure is less than a preset pressure, and the medium radioactive dose is less than a first preset radioactive dose). When the power plant state changes, such as during shutdown and startup, the medium in the pipeline removes heat from the core, thereby changing from a low state to a high state.

[0047] In one embodiment, please refer to Figure 1 The ventilation system also includes an air supply control valve 400, which is installed on the first air supply branch 110 and located upstream of the corresponding isolation valve of the first air supply branch 110. The air supply control valve 400 is used to adjust the air supply volume of the first air supply branch 110. The air supply control valve 400 is located upstream of the corresponding isolation valve. The isolation valve can provide a certain degree of protection for the air supply control valve 400, reducing the impact of the high-temperature medium in the duct room 600 on the air supply control valve 400.

[0048] In another embodiment, the ventilation system further includes an exhaust control valve 500 installed in the first exhaust branch 210, downstream of the corresponding isolation valve of the first exhaust branch 210. The exhaust control valve 500 is used to adjust the exhaust volume of the first exhaust branch 210. The exhaust control valve 500 is located downstream of the corresponding isolation valve. The isolation valve can provide a certain degree of protection for the corresponding exhaust control valve 500, reducing the impact of high-state shutoff within the duct room 600 on the exhaust control valve 500.

[0049] It is understandable that the isolation valve can only have two states, open and closed, and cannot accurately control the flow of the corresponding flow channel.

[0050] In one embodiment, the isolation valve is a butterfly valve. The butterfly valve is compact and easy to operate. It can be equipped with electric, pneumatic, or manual actuators to achieve remote or automated control. It can also adapt to harsh environments and accommodate the function of sealing the pipe room 600. It is understood that other embodiments of the present application are not limited to the type of isolation valve; the butterfly valve can also be a ball valve or a globe valve with isolation functions.

[0051] For example, the isolation valve can close quickly, typically within 5 seconds, and has a fail-safe position of closed. This allows for rapid closure in the event of an accident to prevent the spread of hazardous gases. The isolation valve is equipped with an electric actuator and electromagnetic clutch. De-energizing the electromagnetic clutch causes the valve to close rapidly, achieved by spring compression. When the electromagnetic clutch is energized, the actuator opens the valve. The isolation valve provides position feedback for both opening and closing, which is transmitted to the controller so that power plant operators can constantly check the correct valve position.

[0052] For example, the isolation valve has high sealing requirements, requiring that under the test pressure of 0.11MPa, the pressure should be maintained for 10 minutes, there should be no obvious leakage in the flange and shell of the valve body, and the valve seat should allow a leakage rate of ≤3cm 3 / h. The material of the isolation valve can be carbon steel.

[0053] The isolation valve is configured to withstand a cumulative radiation aging dose of 2100 Gy and an accidental radiation dose of 100 kGy. The isolation valve is configured to be able to close and open under design basis earthquake conditions.

[0054] The present application also provides a power plant, comprising a duct room 600, ducts, and any of the above-described ventilation systems. The duct room 600 has an installation chamber 600a, within which the ducts are located. The ventilation system is installed in the duct room 600 and is used to cool the ducts. Exemplarily, the power plant is a nuclear power plant.

[0055] In one embodiment, please refer to Figure 1The duct room 600 includes an isolation tube 610 and a duct room body 620. An installation chamber 600a is formed within the duct room body 620. The isolation tube 610 is sealed and mounted to the duct room body 620, preventing the medium in the installation chamber 600a from flowing out of the connection between the isolation tube 610 and the duct room body 620. The duct room body 620 also has an opening 620a communicating with the installation chamber 600a. The isolation tube 610 is connected to at least one opening 620a. An isolation valve can be installed in the isolation tube 610 to prevent gas in the installation chamber 600a from entering the corresponding first air supply branch 110 and / or first exhaust branch 210. The isolation tube 610 can extend the installation position for the isolation valve. If there is no suitable installation position for the isolation valve on the sidewall of the duct room body 620, installing the isolation valve in the isolation tube 610 can still prevent gas in the installation chamber 600a from entering the corresponding first air supply branch 110 or first exhaust branch 210. Exemplarily, there are multiple isolation valves, at least some of which are first isolation valves 310, and the remaining isolation valves are second isolation valves 320. The first isolation valves 310 are respectively connected to the first air supply branch 110 and the corresponding opening 620a, and the second isolation valves 320 are respectively connected to the first exhaust branch 210 and the corresponding opening 620a. The connection between the isolation valves and the opening 620a can be direct or indirect. When an isolation tube 610 is provided circumferentially around the opening 620a connected to the first isolation valve 310, the first air supply branch 110, the first isolation valve 310, the air supply port 120, the isolation tube 610, and the corresponding opening 620a are sequentially connected. When an isolation tube 610 is provided circumferentially around the opening 620a connected to the second isolation valve 320, the opening 620a, the isolation tube 610, the exhaust port 220, the second isolation valve 320, and the first exhaust branch 210 are sequentially connected.

[0056] The isolation tube 610 is configured to withstand a first predetermined temperature, a predetermined pressure, and a first predetermined radioactive dose. The isolation tube 610 is capable of withstanding high-state media, and thus, in the event of a breach, the isolation tube 610 remains sealed, thereby reducing the possibility of high-state media spillage.

[0057] In another embodiment, see Figure 1The air supply branch 100 also includes a second air supply branch 130, located downstream of the first air supply branch 110. The first isolation valve 310 is located between the first and second air supply branches 110 and 130. The second air supply branch 130 is located within the installation chamber 600a. The second air supply branch 130 can modify the air supply path from the air supply branch 100 to the duct room 600. For example, the second air supply branch 130 can be extended to the vicinity of the duct, allowing the air supply branch 100 to blow directly into the duct, thereby increasing cooling efficiency. The air outlet 120 is located at the end of the second air supply branch 130.

[0058] The exhaust branch pipe 200 also has a second exhaust path. The fourth exhaust branch 230 is located upstream of the first exhaust branch 210. The second isolation valve 320 is located between the first exhaust branch 210 and the fourth exhaust branch 230. The fourth exhaust branch 230 is located in the installation chamber 600a. The exhaust port 220 is located at the end of the fourth exhaust branch 230.

[0059] It is understood that other embodiments of the present application do not limit the structures of the air supply branch 100 and the exhaust branch 200. For example, the gas in the air supply branch 100 flows through the first air supply branch 110 to the opening 620a and then enters the installation chamber 600a. The gas in the installation chamber 600a can also directly enter the first exhaust branch 210 through the corresponding opening 620a.

[0060] In one embodiment, please refer to Figure 1 The pipe room 600 also has a pressure relief port connecting the installation room 600a and the outside world. The power plant also includes a blasting component installed in the pipe room 600. The blasting component can prevent the gas in the installation room 600a from flowing from the pressure relief port to the outside world. Exemplarily, the blasting component is a blasting diaphragm. The blasting component can open the pressure relief port under the condition of bearing the rated air pressure, so that the gas in the installation room 600a can flow from the pressure relief port to the outside world. Exemplarily, the rated air pressure is greater than the preset air pressure. When the air pressure in the pipe room 600 reaches the rated air pressure, the internal gas can break through the blasting component to be discharged to the outside world, so that the air pressure in the pipe room 600 can return to the normal range, and the temperature in the pipe room 600 can drop to the ambient temperature. The high-state medium originally in the pipe room 600 is condensed into liquid, and the operator can enter the pipe part for maintenance and purify and replace the air in the pipe room 600.

[0061] This application intends to provide a control method for a ventilation system. Figures 3 to 5 , applied to the duct room 600, the ventilation system has an air supply port 120 and an air exhaust port 220 connected to the duct room 600, and the control method includes: Step S1: obtaining at least one of the temperature in the pipeline room, the liquid level in the pit in the pipeline room, and the air pressure in the pipeline; Step S2: Determine whether a pipe in the pipe room has been breached; Step S3: When a breach occurs in the pipeline, the air supply and exhaust ports are closed.

[0062] It is understood that the temperature within the piping room 600, the liquid level in the pit within the piping room 600, and the air pressure within the piping can all be measured using corresponding monitoring instruments. Any of these media, whether high-temperature or high-pressure, that spreads to rooms outside of the piping room 600 could affect safety features within those rooms, thereby expanding the scope of the accident. The media within the piping may contain a certain level of radioactivity, and the escape of this radioactive medium to other areas could cause damage to equipment and personnel in those areas.

[0063] In the solution of the embodiment of the present application, the temperature in the duct room 600, the height of the pit liquid level, and the air pressure in the duct are used to determine whether to close the air supply 120 and exhaust 220 of the ventilation system. In the event of a rupture in the duct, the environment in the duct room 600 will deteriorate rapidly. Closing the air supply 120 and exhaust 220 can reduce the gas in the duct room 600 from flowing through the ventilation system to other rooms, thereby contaminating other rooms. The control method of the present application can react relatively quickly in the event of a rupture to close the duct room 600, reduce the gas overflow in the duct room 600, and reduce the scope of the accident.

[0064] In one embodiment, please refer to Figure 4 When a breach occurs in the pipeline, the steps of closing the air supply port 120 and the air exhaust port 220 include: Step S30: When the first condition is met, the air supply port and the air exhaust port are closed; The first condition is at least one of the following: (1) the temperature in the pipeline room 600 is greater than or equal to the second preset temperature; (2) the pit liquid level in the pipeline room 600 is greater than or equal to the preset pit liquid level; (3) the rate of change of the air pressure in the pipeline is greater than or equal to the preset rate of change.

[0065] In the embodiment of the present application, the control method can react relatively quickly to seal the duct room 600 when the first condition is met, thereby reducing gas leakage from the duct room 600 and narrowing the scope of the accident. Furthermore, in the event of a pipeline rupture, the air pressure within the pipeline will decrease relatively gradually. The rate of change in the air pressure within the pipeline can be used to indicate the rupture, further improving the control method's response speed and thereby reducing the extent of medium leakage.

[0066] In one embodiment, please refer to Figure 3 , the control method of the ventilation system also includes: Step S4: obtaining at least one of the temperature, air pressure, and radioactive dose in the pipeline; Step S5: When the second condition is met, close the exhaust vent; The second condition is at least one of the following: (1) the temperature in the pipeline is greater than or equal to a first preset temperature; (2) the air pressure in the pipeline is greater than or equal to a preset air pressure; (3) the radioactive dose in the pipeline is greater than or equal to a first preset radioactive dose. It should be noted that step S3 has no obvious contextual relationship with step S1. Monitoring the medium in the pipeline and monitoring the pipeline room 600 are performed through different monitoring methods. Therefore, step S3 and step S1 can be performed simultaneously.

[0067] In the embodiment of the present application, when the environment in the pipeline reaches one of a first preset temperature, a preset air pressure, and a first preset radioactive dose, it can be determined that the medium currently being transported in the pipeline is at a high state. When the medium in the pipeline reaches a high state, the consequences of a pipeline rupture accident are more serious than in normal situations. If a rupture accident has not yet occurred, the exhaust port 220 is sealed in advance, which can further reduce the possibility of the medium entering the ventilation system through the exhaust port 220 in the event of a rupture accident, and the ventilation system's response has an early warning function.

[0068] In one embodiment, please refer to Figure 4 When the second condition is met, the step of closing the air outlet 220 includes: Step S50: When the second condition is met and the pipeline is not broken, the air supply port is opened and the air exhaust port is closed; In the solution of the embodiment of the present application, when the medium in the pipeline reaches a high state and no breach accident occurs, the exhaust port 220 of the ventilation system can be closed in advance to further reduce the flow of the medium to other areas. Keeping the air supply port 120 in an open state enables the ventilation system to continuously cool the duct room. The ventilation system continuously delivers cold air to the interior of the duct room 600 through the air supply port 120, which can reduce the temperature of the duct room. The local air pressure at the air supply port 120 is positive. In the event of a breach accident, the medium flowing out of the duct is difficult to quickly enter the ventilation system from the air supply port 120. The air supply port 120 can still be closed relatively promptly, so that when the duct room 600 further deteriorates, the medium enters the interior of the ventilation system.

[0069] In one embodiment, please refer to Figure 5 When the pipeline is breached and the air supply port 120 and the air exhaust port 220 are closed, the control method further includes: Step S6: When the temperature in the pipeline room reaches the exhaust temperature, the exhaust port and the second sealing valve are opened and the first sealing valve is closed.

[0070] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of protection.

Claims

1. A ventilation system between pipelines in a power plant, characterized in that: Applicable to a power plant, the power plant includes a pipeline room, and the ventilation system includes: an air supply branch pipe having a first air supply branch and an air supply port, wherein gas can flow from the first air supply branch to the air supply port to enter the duct room; an exhaust branch pipe having a first exhaust branch and an exhaust port, wherein gas can flow from the interior of the duct room through the exhaust port to the first exhaust branch; Isolation valve, the first air supply branch and the first exhaust branch are both provided with the isolation valve, the isolation valve is used to inhibit the gas in the pipeline room from entering the first air supply branch and the first exhaust branch when a rupture occurs in the pipeline room, and the isolation valve is configured to withstand a first preset temperature, and / or a preset air pressure, and / or a first preset radioactive dose.

2. The ventilation system according to claim 1, characterized in that The ventilation system also includes a first monitor and a controller. The first monitor is configured to obtain at least one of the temperature in the pipe room, the height of the pit liquid level in the pipe room, and the air pressure in the pipe. The controller is configured to control the opening and closing status of the isolation valve. The controller can determine whether a rupture occurs in the pipe in the pipe room based on the data obtained by the first monitor. When the controller determines that a rupture occurs, the controller controls the isolation valve to close the air supply port and the exhaust port.

3. The ventilation system according to claim 2, characterized in that When the data acquired by the first monitor meets a first condition, the controller closes the isolation valve corresponding to the air supply port and the isolation valve corresponding to the air exhaust port; The first condition is at least one of the following: The temperature in the pipeline room is greater than or equal to a second preset temperature; The liquid level height of the pit between the pipelines is greater than or equal to the preset liquid level height of the pit; The rate of change of the air pressure in the pipeline is greater than or equal to a preset rate of change; The second preset temperature is 75° C., and / or the preset pit liquid level height is 0.15 m, and / or the preset change rate is 830 Pa / s.

4. The ventilation system according to claim 2, characterized in that The exhaust branch pipe also has a second exhaust branch and a third exhaust branch. The second exhaust branch and the third exhaust branch can be connected to the first exhaust branch. The ventilation system also includes a first sealing valve arranged on the second exhaust branch and a second sealing valve arranged on the third exhaust branch. The third exhaust branch is used to connect with the nuclear island chimney. When the controller determines that a breach has occurred, the isolation valve and the first sealing valve are closed. When the first monitor monitors that the temperature in the pipeline room reaches the exhaust temperature, the isolation valve and the second sealing valve are opened to connect the nuclear island chimney with the pipeline room.

5. The ventilation system according to claim 4, characterized in that The ventilation system further includes a filter assembly, which is disposed in the third exhaust branch and is located downstream of the second sealing valve.

6. The ventilation system according to claim 5, characterized in that The filtration assembly includes a filter and an iodine adsorber.

7. The ventilation system according to claim 1, characterized in that The ventilation system further includes a second monitor and a controller, wherein the second monitor is configured to obtain at least one of the temperature, air pressure, and radioactive dose in the pipeline, and when the data obtained by the second monitor meets a second condition, the controller closes the isolation valve corresponding to the exhaust port; The second condition is at least one of the following: The temperature in the pipeline is greater than or equal to a first preset temperature; The air pressure in the pipeline is greater than or equal to the preset air pressure; The radiation dose in the pipe is greater than or equal to a first preset radiation dose.

8. The ventilation system according to claim 7, characterized in that When the data acquired by the second monitor meets the second condition and no breach occurs, the controller closes the isolation valve corresponding to the exhaust port and opens the isolation valve corresponding to the supply port.

9. The ventilation system according to claim 1, wherein: The ventilation system further includes an air supply regulating valve, which is installed on the first air supply branch and is located upstream of the isolation valve provided on the first air supply branch, and / or The ventilation system further includes an exhaust regulating valve, which is installed on the first exhaust branch and is located downstream of the isolation valve corresponding to the first exhaust branch.

10. The ventilation system according to claim 1, wherein The isolation valve is a butterfly valve.

11. A power plant, characterized in that: include: Pipe room, with installation room; a pipeline located in the installation room; The ventilation system according to any one of claims 1 to 10, installed between the pipes, and the ventilation system is used to cool the pipes.

12. The power plant according to claim 11, characterized in that The duct room includes an isolation tube and a duct room body. The installation chamber is formed in the duct room body. The isolation tube is sealed and installed in the duct room body. The duct room body further has an opening communicating with the installation chamber. The isolation tube is communicated with at least one of the openings. The isolation valve can be installed in the isolation tube to prevent gas in the installation chamber from entering the corresponding first air supply branch and / or the first air exhaust branch. Wherein, the isolation tube is configured to be able to withstand the first preset temperature, and / or the preset air pressure, and / or the first preset radioactive dose.

13. The power plant according to claim 11, characterized in that The pipeline room also has a pressure relief port connecting the installation room and the outside world. The power plant also includes a blasting device installed in the pipeline room. The blasting device can isolate the installation room from the outside world. The blasting device can open the pressure relief port under the condition of bearing the rated air pressure so that the gas in the installation room can flow from the pressure relief port to the outside world.

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